#!/bin/bash
#
# Make a symlink to _servicer.sh with this syntax:
#  - XX-myservice-user-type.action
# 
# where:
#  - XX is a number (ex: 10)
#  - myservice will be the name of the service (it will create /var/run/myservice.pid for checking service status)
#  - user is the user the service will run as. Can be omitted, in this case use two "--", and user=service
#  - type is one of:
#        - script: the service is managed by a script ($user_home/myservice_start.sh or $user_home/myservice.sh, and $user_home/myservice_stop.sh (optional))
#        - service: the service command is specified inside a service_${service}_start file in the user home folder
#  - action is either start or stop
#
# 

LOG_PATH=/var/log/servicer
test ! -d "${LOG_PATH}" && mkdir "${LOG_PATH}"
actions_logs="${LOG_PATH}/servicer.log"

service_user_type_action=${0#*-}
SERVICE=${service_user_type_action%%-*}
user_type_action=${service_user_type_action#*-}
USER=${user_type_action%-*}
test -z ${USER} && USER=${SERVICE}
type_action=${user_type_action#*-}
TYPE=${type_action%.*}
ACTION=${type_action#*.}

passwd_entry=$(getent passwd ${USER}) || exit 255
USER_HOME=$(echo ${passwd_entry} | cut -d: -f 6)

echo "$(date): ${ACTION}-ing service '${SERVICE}' for user '${USER}', as '${TYPE}' (${USER_HOME})" >> ${actions_logs}

if [ "${ACTION}" = "start" ]
then
        test -e "${LOG_PATH}/${SERVICE}" || {
                mkdir "${LOG_PATH}/${SERVICE}"
        } && chown -R ${USER} "${LOG_PATH}/${SERVICE}"
        extra_opts=(-1 "${LOG_PATH}/${SERVICE}/${SERVICE}.out.log" -2 "${LOG_PATH}/${SERVICE}/${SERVICE}.err.log")
        if [ "${TYPE}" = "script" ]
        then
                echo "          ... checking for start scripts ..." >> ${actions_logs}
                start_script="${USER_HOME}/${SERVICE}_start.sh"
                test -e ${start_script} || start_script="${USER_HOME}/${SERVICE}.sh"
                echo "          ... detected '${start_script}' ..." >> ${actions_logs}
                COMMAND="${start_script}"
                ARGUMENTS=""
        elif [ "${TYPE}" = "service" ]
        then
                echo "          ... checking for config settings ..." >> ${actions_logs}
                source_script="${USER_HOME}/service_${SERVICE}_start"
                test -e "${source_script}" || {
                        echo "Error, missing '${source_script}'" >> ${actions_logs}
                        exit 255
                }
                echo "          ... sourcing '${source_script}'..." >> ${actions_logs}
                source "${source_script}"
        fi
        action=(-b -m --start "${COMMAND}" -- ${ARGUMENTS[@]})
elif [ "${ACTION}" = "stop" ]
then
        extra_opts=()
        if [ "${TYPE}" = "script" ]
        then
                echo "          ... checking for stop script ..." >> ${actions_logs}
                stop_script="${USER_HOME}/${SERVICE}_stop.sh"
                test -e "${stop_script}" && {
                        echo "          ... running '${stop_script}' ..." >> ${actions_logs}
                        su - ${USER} -c "${stop_script}"
                }
        elif [ "${TYPE}" = "service" ]
        then
                true
        fi
        action=(--stop ${SERVICE})
fi

echo start-stop-daemon -p /var/run/${SERVICE}.pid ${extra_opts[@]} -u ${USER} -d ${USER_HOME} ${action[@]} >> ${actions_logs}
start-stop-daemon -p /var/run/${SERVICE}.pid ${extra_opts[@]} -u ${USER} -d ${USER_HOME} ${action[@]}

echo "$(date): ${ACTION}-ed service '${SERVICE}' for user '${USER}', as '${TYPE}' (${USER_HOME})" >> ${actions_logs}